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Journal articles
Higher-Order Leaky-Mode Bessel-Beam Launcher
Abstract : We present a Bessel-beam launcher based on a leaky radial waveguide consisting of a capacitive sheet over a ground plane that supports higher-order leaky modes. A propagating Bessel beam is generated above the radiating waveguide. The Bessel beam is transverse-magnetic (TM) polarized with a vertical component of electric field that is a zeroth-order Bessel function of the first kind. A higher-order leaky-wave mode is used to reduce losses at millimeter waves and, at the same time, avoid the thin dielectric layers used in previously proposed lower order leakywave Bessel launchers. Closed-form design equations are provided for the proposed structure. In addition, the operating bandwidth of the launcher is defined using dispersion analysis. Near-field measurements of a prototype operating in the frequency range 38- 39.5 GHz validate the concept. The measured launcher generates a Bessel beam with a stable spot size of about 4.3 mm (0.57 λ) over a nondiffractive range of about 16.4 mm (2.2 λ), within about a 4% fractional bandwidth
Keywords :
near-field measurements
millimetre wave propagation
near-field focusing
Apertures
millimeter waves
Impedance
high-order modes
higher-order leaky-wave mode
higher-order leaky modes
electromagnetic launchers
frequency 38 GHz to 39.5 GHz
operating bandwidth
electric field
dispersion analysis
Dispersion
capacitive sheet
Bessel beams
Bessel-beam launcher
Bandwidth
artificial surface
leaky waves
leaky radial waveguide
Approximation methods
zeroth-order Bessel function
transverse-magnetic
Prototypes
propagating Bessel beam
Index Terms-Bessel beams
artificial sur- face
Cited literature [37 references]
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01331289
Contributor : Laurent Jonchère <>
Submitted on : Thursday, March 12, 2020 - 10:49:16 AM
Last modification on : Tuesday, October 6, 2020 - 3:09:44 AM
Long-term archiving on: : Saturday, June 13, 2020 - 1:56:36 PM
Contributor : Laurent Jonchère <>
Submitted on : Thursday, March 12, 2020 - 10:49:16 AM
Last modification on : Tuesday, October 6, 2020 - 3:09:44 AM
Long-term archiving on: : Saturday, June 13, 2020 - 1:56:36 PM
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01331289.pdf
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